The most realistic CGI you've ever seen?

Can you tell the difference between real footage and CGI? To find out, check out the super-realistic advertisement in the video above. The ad has been causing a stir online this week, as viewers are baffled at the level of detail achieved by CGI alone.

Even more impressive is the fact that the two-man team behind the video created it using only off-the-shelf software, in a mere ten weeks.

But is this achievement down to skill alone, or is it just a question of computer power?